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Alright so i noticed a huge difference in mpg and no i been baby footing for the past few days to see if it is my driving habit and it is not. I am wondering if its an exhaust leak or because i didn't disconnect the negative battery terminal to reset and relearn. Which it told me to do in the instructions. But I had no idea if that coukd cause an issue due to cars being self learning. Im going to disconnect my battery tomorrow while im at the shop at work and see if anything happens. Any opinions or advice is welcome. But like i said this is very noticeable. I know for a fact when it says im getting 21 mpg highway the whole time when it feels more like 15 mpg. That and i drove 50 miles today and my gas gauge read like i just drove over that. This is highway to highway when i got on it and then off it. Went from 145 till empty to 65.